Here are all of the things that I installed for myself.
The Sims 2: Ultimate Collection
The Sims 3 plus expansions
The Sims 4 plus Get To Work
Garry's Mod
RWBY: Grimm Eclipse.
Terrarria.
Team Fortress 2? (I think that's still installed?)
A PSP emulator (It isn't illegal if it's Japanese, folks!)
A PS2 emulator (I HAD THE GAMES BEFORE BUT MY PS2 BROKE)
Aaand that's it.

lemme tell you a story. once upon a time i had a 5 posts per day streak

I have too many to list, but here is the games that I play (All on PC)

Grand Theft Auto V
My Summer Car
The Division
Prison Architect
American/Euro Truck Sim's
DiRT 3 Complete Edition
FTL
BeamNG
Sims 3 with all Expansion's (Can't play due to current HDD almost dead, got a new one on desk...)
Maybe a few others

Also have Railroad Tycoon 3 installed, but frankly am not certain if I can run it on Windows 10.

Of these, I've played the most of Sims 2 (with a bullet), EU4, Banished, CK2, Sims 3, and Civ 5. (EU3, the Baldur's Gate games, and Vicky II are probably up there as well, but I don't have any specific hours on them as I originally had them long before Steam.)